Last month, the boys of One Way released their music video for the acoustic version of "Rainy Days". Promising that they would follow up with another video for the original track, a preview has just been unveiled for their fans. Guest-starring�2PM's Junsu (stylized as 'Jun.K'), it looks like the boys have gone for an stylish presentation - suited up, they croon in a dimly-lit warehouse, sparsely decorated with a rusty piano and faded furniture. Check back with allkpop for the official drop of "Rainy Days" on January 4th!